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Good filter?

Where can i get a good filter with low pressure loss, I'm putting it in front of my DCA, and can some one please describe to me what non toxic means? I mean im gonna put feritlizer on the ground and water it, not actually inject it into the system? Should i be worried about my health? Also What is the deal with, regular dca's and lead free dca's! Thinking of useing a Febco 850, they have both type?